ASoC: codecs: tfa989x: Add support for tfa9897 optional rcv-gpios

Some OEM use a GPIO in addition to the tfa9897 RCV bit to
switch between loudspeaker and earpiece/receiver mode.

Add support for the GPIO switching by specifying rcv-gpios in DT.
Signed-off-by: Vincent Knecht <vincent.knecht@mailoo.org>
Link: https://lore.kernel.org/r/20211031210956.812101-3-vincent.knecht@mailoo.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/tfa989x.c

@@ -7,6 +7,7 @@
  * Copyright (C) 2013 Sony Mobile Communications Inc.
  */
 
+#include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/module.h>
 #include <linux/regmap.h>
@@ -56,6 +57,7 @@ struct tfa989x_rev {
 struct tfa989x {
 	const struct tfa989x_rev *rev;
 	struct regulator *vddd_supply;
+	struct gpio_desc *rcv_gpiod;
 };
 
 static bool tfa989x_writeable_reg(struct device *dev, unsigned int reg)
@@ -99,10 +101,20 @@ static const struct snd_soc_dapm_route tfa989x_dapm_routes[] = {
 	{"Amp Input", "Right", "AIFINR"},
 };
 
+static int tfa989x_put_mode(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
+	struct tfa989x *tfa989x = snd_soc_component_get_drvdata(component);
+
+	gpiod_set_value_cansleep(tfa989x->rcv_gpiod, ucontrol->value.enumerated.item[0]);
+
+	return snd_soc_put_enum_double(kcontrol, ucontrol);
+}
+
 static const char * const mode_text[] = { "Speaker", "Receiver" };
 static SOC_ENUM_SINGLE_DECL(mode_enum, TFA989X_I2SREG, TFA989X_I2SREG_RCV, mode_text);
 static const struct snd_kcontrol_new tfa989x_mode_controls[] = {
-	SOC_ENUM("Mode", mode_enum),
+	SOC_ENUM_EXT("Mode", mode_enum, snd_soc_get_enum_double, tfa989x_put_mode),
 };
 
 static int tfa989x_probe(struct snd_soc_component *component)
@@ -301,6 +313,12 @@ static int tfa989x_i2c_probe(struct i2c_client *i2c)
 		return dev_err_probe(dev, PTR_ERR(tfa989x->vddd_supply),
 				     "Failed to get vddd regulator\n");
 
+	if (tfa989x->rev->rev == TFA9897_REVISION) {
+		tfa989x->rcv_gpiod = devm_gpiod_get_optional(dev, "rcv", GPIOD_OUT_LOW);
+		if (IS_ERR(tfa989x->rcv_gpiod))
+			return PTR_ERR(tfa989x->rcv_gpiod);
+	}
+
 	regmap = devm_regmap_init_i2c(i2c, &tfa989x_regmap);
 	if (IS_ERR(regmap))
 		return PTR_ERR(regmap);